diff --git a/app/src/main/java/org/ntlab/radishforandroidstudio/framework/RWT/RWTPad.java b/app/src/main/java/org/ntlab/radishforandroidstudio/framework/RWT/RWTPad.java
index 49de1d0..cb3a0b9 100644
--- a/app/src/main/java/org/ntlab/radishforandroidstudio/framework/RWT/RWTPad.java
+++ b/app/src/main/java/org/ntlab/radishforandroidstudio/framework/RWT/RWTPad.java
@@ -4,18 +4,18 @@
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Paint;
-import android.support.v7.widget.AppCompatButton;
+import android.graphics.Point;
 import android.util.AttributeSet;
 import android.view.MotionEvent;
-import android.view.View;
 
 import org.ntlab.radishforandroidstudio.framework.event.PadEvent;
 import org.ntlab.radishforandroidstudio.framework.listener.PadListener;
 import org.ntlab.radishforandroidstudio.framework.listener.SamplePadListener;
 import org.ntlab.radishforandroidstudio.framework.subject.PadSubject;
 
-public class RWTPad extends View {
+public class RWTPad extends RWTView {
     private MotionEvent touchInfo = null;
+    private Point circlePos = null;
 
     public RWTPad(Context context) {
         super(context);
@@ -32,16 +32,24 @@
         init();
     }
 
+    @Override
     public void init() {
+        super.init();
         // Listenerサンプル
         addListener(new SamplePadListener());
     }
 
     @Override
     public void onDraw(Canvas canvas) {
-        super.onDraw(canvas);
+        // super.onDraw(canvas);
         Paint paint = this.createRedPaint();
-        canvas.drawCircle(150, 150, 100, paint);
+        canvas.drawCircle(getSize().x / 2, getSize().x / 2, getSize().x / 2, paint);
+
+        paint.setColor(Color.BLUE);
+        if (circlePos == null) {
+            circlePos = new Point(getSize().x / 2, getSize().y / 2);
+        }
+        canvas.drawCircle(circlePos.x, circlePos.y, getSize().x / 6, paint);
     }
 
     private Paint createRedPaint() {
@@ -55,10 +63,33 @@
 
     @Override
     public boolean onTouchEvent(MotionEvent event) {
+        // 中央からの距離を取得
+        float dx = event.getX() - getSize().x / 2;
+        float dy = event.getY() - getSize().y / 2;
+        float rawLen = (float)Math.sqrt(dx*dx + dy*dy);
+        float angle = (float)Math.atan2(dy, dx);
+        float maxLen = getSize().x / 2;
+        float len = rawLen / maxLen;
+        float fixLen = Math.max(Math.min(1.f, len), -1.f);
+
+        circlePos.x = (int)event.getX();
+        circlePos.y = (int)event.getY();
+
+        if (len > 1) {
+            circlePos.x = (int)(fixLen * Math.cos(angle) * maxLen + maxLen);
+            circlePos.y = (int)(fixLen * Math.sin(angle) * maxLen + maxLen);
+        }
+
         touchInfo = event;
-        PadEvent padEvent = new PadEvent(event, 1.0f);
+        PadEvent padEvent = new PadEvent(event, fixLen, angle);
         PadSubject.getInstance().pushListeners(padEvent);
-        System.out.println("Touch x:");
+
+        if (event.getAction() == MotionEvent.ACTION_UP) {
+            circlePos.x = getSize().x / 2;
+            circlePos.y = getSize().y / 2;
+        }
+
+        invalidate();
         return true;
     }